Cylinder lock



M C. MAXWELL.

' CYLiNDER LOCK. APPLICATION FILED MAR, 29, I922.

$22 595 Patented July 111 1922 6H0: Mags 'u i m .1 is UNHTEEQ rate.

MAXWELL C. MAXW'ELL, 0F STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TOWNE MANUFACTURING COMPANY, OF STAMFORD, CONNECTICUT.

CYLINDER LOCK.

Application filed March 29, 1922.

T 0 all whom it may concern Be it known that l, MAXWELL C. MAX- WELL, a citizen of the United States, and a resident of Stamford, in the county of Fain tied and State of Connecticut, have invented certain new and useful Improvements in Cylinder Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in cylinder locks of the pin tumbler type, and more particularly to means whereby the cylinder of the lock may be armored,-one object of the invention being to provide efficient means for securing a hardened steel armor cap or facing to the end of the lock cylinder to prevent access to the tumblers or their drivers with the use of a boring tool.

With this and other objects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation showing the application of my improvements to a lock cylinder. Figure 2 is a similar view taken at right angles to Figure l, and Figure 3 is a rear view of the armor cap or facing.

in Figures 1 and 2 of the drawings, I have represented at l, a lock cylinder, the wall of which is provided with a plurality of recesses 2. In the embodiment of the invention shown in the drawings, the cylinder is provided with two such recesses located diametrically opposite each other but a greater number of such recesses may be employed if desired.

Specification of Letters Patent.

Patented July ill, 1922.

Serial No. 5475M.

An armor cap or facing 3, preferably of hardened steel, is located on the end of the cylinder 1 and is provided at certain points of its edge portion with a plurality of cars l,-such ears corresponding in number with that of the recesses 2 and being disposed in said recesses so that their outer faces will be flush with the outer wall of the cylinder.

Each ear d is provided with a perforation for the accommodation of a screw 5, such screws being threaded into suitable sockets in the cylinder, and thus the hardened steel armor cap or facing is securely fastened to the end of the cylinder and the fastening means will, when the lock cylinder is in its housing, be concealed,

i-laving fully described invention what I claim and desire to secure by Lettersratent, is:

1. The combination with a lock cylinder, of an armor cap or facing on the end of the cylinder and provided with ears disposed parallel with the wall of the cylinder and secured thereto.

2. The combination with a lock cylinder having recesses in its peripheral wall, of an armor cap or facing on the end of the cylinder, ears projecting from said armor cap or facing and entering said recesses in the cylinder wall, and fastening devices passing through said ears and enterng the cylnder.

In testimony whereof, I have signed this specification in the presence of two subscribi g witnesses.

MAXXVELL C. MAXWELL.

Crmpnns A. BERRY. 

